Gaya APA
Ferber, Robert. (1962).
Research methods in economics and business .
America:
The Macmillan Company.
Gaya Chicago
Ferber, Robert.
Research methods in economics and business.
America:
The Macmillan Company,
1962.
Text.
Gaya MLA
Ferber, Robert.
Research methods in economics and business.
America:
The Macmillan Company,
1962.
Text.
Gaya Turabian
Ferber, Robert.
Research methods in economics and business.
America:
The Macmillan Company,
1962.
Print.